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Message: <blockquote data-quote="MacInWin" data-source="post: 1831886" data-attributes="member: 396914"><p>Let me see if I can parse out this to make sure I understand. If you click on the "View" box at the top of Disk Utility, there should be some options there. One is "Show only volumes" and the other is "Show all devices." I would bet that "Show only Volumes" is checked. Change to the other option and the fusion drive should show up with the two volumes indented below it. I give up on the rest of the sentence, I can't make heads or tails out of what you are trying to say, sorry.  The reason the fusion drive is greyed out is that you cannot format the boot drive while booted from it. So you have to boot from recovery, or an external drive to get erase access to the internal fusion drive itself.</p></blockquote><p></p>